本文關鍵詞： 激光選區(qū)熔化 氧化鋁 溫度場 應力場 熔化程度 掃描策略 預熱溫度　出處：《南京理工大學》2017年碩士論文　論文類型：學位論文

【摘要】：陶瓷材料具有耐高溫、耐腐蝕、耐磨損、高強度、高硬度、抗氧化等諸多優(yōu)點,近年來在航空航天、生物醫(yī)療、汽車、建筑領域內(nèi)的應用日益廣泛。然而,陶瓷材料固有的高強度、高硬度、高脆性等特性給傳統(tǒng)加工工藝帶來了挑戰(zhàn),尤其對于形狀復雜的陶瓷件,通常需要借助于復雜的模具實現(xiàn),生產(chǎn)周期長,制造成本高,某種程度上限制了陶瓷材料的應用和發(fā)展。激光選區(qū)熔化技術(Selective Laser Melting,SLM)熔融成形、無需模具、適用材料種類多的技術優(yōu)越性為復雜陶瓷構件的快速制造提供了新的思路。開展陶瓷材料SLM成形工藝的研究,不僅可以豐富成形陶瓷的工藝手段,而且能夠顯著縮短陶瓷零件的生產(chǎn)流程,提高成形件性能。本文主要開展氧化鋁陶瓷材料激光選區(qū)熔化成形過程模擬與實驗分析研究,基于仿真分析和工藝實驗,研究關鍵工藝參數(shù)對陶瓷材料SLM成形效果的影響。主要研究工作包括如下四點:(1)研究了 SLM有限元分析理論以及仿真模型構建方法,基于溫度場、應力場有限元分析理論,設定了熱源函數(shù)和邊界條件,實現(xiàn)了材料性能非線性處理以及相變潛熱處理,建立了陶瓷材料有限元分析模型;(2)研究了氧化鋁陶瓷材料SLM成形溫度場仿真分析方法,通過研究熔池尺寸、溫度梯度分布、液相時間、升溫速率分析了激光掃描速度、激光功率、掃描策略和預熱溫度對溫度場分布的影響;(3)研究了氧化鋁陶瓷材料SLM成形應力場仿真分析方法,基于間接熱應力耦合法實現(xiàn)了氧化鋁應力場模型的構建,探索了成形過程中的應力場分布規(guī)律,分析了激光掃描策略和預熱溫度對應力場分布的影響;(4)開展了氧化鋁陶瓷材料SLM成形工藝實驗,研究了不同氧化鋁粉末狀態(tài)對應的鋪粉質量差異,分析了掃描速度、激光功率、掃描策略對氧化鋁陶瓷材料熔化程度的影響,探索了預熱溫度對成形效果的影響規(guī)律,驗證了仿真結果的有效性。
[Abstract]:Ceramic materials have many advantages, such as high temperature resistance, corrosion resistance, wear resistance, high strength, high hardness, oxidation resistance and so on. In recent years, ceramic materials have been widely used in aerospace, biomedical, automobile and construction fields. The inherent characteristics of ceramic materials such as high strength, high hardness and high brittleness have brought challenges to the traditional processing technology, especially for ceramic parts with complex shapes, which usually need to be realized by means of complex dies, and the production cycle is long. The high manufacturing cost limits the application and development of ceramic materials to some extent. Laser selective Laser melting (SLM) melt forming. The advantages of many kinds of suitable materials provide a new idea for rapid manufacturing of complex ceramic components. The research on SLM forming process of ceramic materials is carried out. It can not only enrich the process of forming ceramics, but also shorten the production process of ceramic parts. In this paper, the simulation and experimental analysis of laser selective melting forming process of alumina ceramic material are carried out, based on simulation analysis and process experiment. The main research work includes the following four points: 1) the theory of SLM finite element analysis and the method of constructing simulation model are studied. Based on the theory of finite element analysis of temperature field and stress field, the heat source function and boundary condition are set up, the nonlinear treatment of material performance and latent heat treatment of phase change are realized, and the finite element analysis model of ceramic material is established. The simulation analysis method of temperature field of alumina ceramic material SLM was studied. The laser scanning speed and laser power were analyzed by studying the size of molten pool, temperature gradient distribution, liquid phase time and heating rate. The influence of scanning strategy and preheating temperature on temperature field distribution; The simulation analysis method of SLM forming stress field of alumina ceramic material is studied. Based on the indirect thermal stress coupling method, the stress field model of alumina is constructed, and the distribution law of the stress field in the forming process is explored. The effects of laser scanning strategy and preheating temperature on force field distribution are analyzed. (4) the SLM forming process experiment of alumina ceramic material was carried out, the quality difference of different alumina powder state was studied, the scanning speed and laser power were analyzed. The effect of scanning strategy on the melting degree of alumina ceramic material was studied. The effect of preheating temperature on the forming effect was explored and the validity of the simulation results was verified.
【學位授予單位】：南京理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TQ174.6

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